Medical isotope production using a subcritical assembly

Someone brought this to my attention, an alternative way of producing medical isotopes: Medical isotope production using a subcritical assembly: http://jnumedmtg.snmjournals.org/cgi/content/meeting_abstract/53/1_MeetingAbstracts/1480 "The system employs a low-enriched uranium (LEU) solution driven by a beam-target deuterium-tritium neutron source that does not have a vacuum window. Pressure in the gas target and a vacuum in the accelerator are maintained with differential pumping. The neutron driver occupies the center of a vessel containing the LEU solution and moderator in a geometry optimized for high efficiency production. Hydrogen and oxygen from radiolysis of water will be recombined and volatile radioactive gas will be removed continuously during operation."